Black and white coloration in cows is dominant to brown and white. Black and white cows were crossed over several years and the following progeny were produced: 8 black and white and 3 brown and white. What is the most probable genotype of each parent?
What is the expected genotypic and phenotypic ratio expected for the progeny in the previous question?
Let B denote black and white color, and b denote brown and white color Genotypes corresponding to black and white color are BB and Bb Genotype corresponding to brown and white color is bb As brown and white offspring were produced, both parents with black and white color must have the recessive allele Thus, both parents have genotypes Bb.
So, the cross was the following:
P: Bb Bb G: B and b B and b F1: BB Bb Bb bb
The expected phenotypic ratio is 3 black and white : 1 brown and white The genotypic ratio is 1 BB: 2 Bb: bb